I have 3 sergers. One is a Brother 929D, a pain to thread but it is a little work horse. Also has a sleeve arm on it, or removable piece so one can get to cuffs, hems for pants easily, etc. I love it, but it doesn't offer to many options.
Also have a Janome compulock, which sews like a dream. It will also do coverstich although, I haven't ever converted it to do coverstitch.
Hubby thought I needed a Pfaff and bought me the 4874. It is a bit intimidating in my book, just because of the many various ways in which to thread it for the various stitches. I don't like it near as much as the Janome. I think I have used it one time to make scrubs for my daughter. That's about all it's been used for.
For little projects my go to machine is either the Brother or the Janome.